Connecting to HTTPS WS requiring user name & PW

I am trying to connect to a web service that is hosted on an IIS server. The web service requires an HTTPS connection and a user name & password. The IIS site's security is configured for "Basic" authentication.

I see that I can enter a WebServiceUsername & WebServicePassword in the Configuration area (lower left of the GUI) *after* connection has been established with the web service and a method is being called, but I am not seeing how to get those credentials
to be used when connecting to the URL in order to retrieve the WSDL.

Hi
i am trying to access a web service that uses Basic Authentication
non of the configuration (proxy credentials or use default credentials under web services in config ) work

you say to enter in the service tab, but there is only Proxy credentials boxes, but no boxes for web services.

if i change the setting on my web service to accept Integrated Auth, i get connected, and then i can override the web service credentials on the bottom left of the screen under Misc tab , but how can i enter these credentials at the first place while my site
uses Basic auth .